| Release Date | Jul 14, 2010 |
| Severity | Low |
| Impact | Fingerprinting
Security Bypass |
| Description | This indicates TCP packets with the FIN flag only ("TCP Headers With FIN Only"). Normally, TCP FIN packets also have the ACK flag to acknowledge the previous packet received.
"TCP FIN Without ACK" can be used to do FIN scan or evade detection. |
| Affected Products | Any Operating System may be affected. |
| Recommended Actions | If required, this signature's action can be set to "Block" to drop such packets. |
Reference: VID-23753
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